Calling C code from frame using JNI through JAVA

[shilpy]

I'm really new to java programming therefore I apologize in advance if this sounds like a stupid question.

I'm using JNI to invoke C code by creating a Swing JFrame and displays it. The code is fairly simple, and the Java-code is working fine if I set frame visibility to false (i.e. the "hello" method is called) whereas when I set frame visibility to true, nothing happens(i.e. the "hello" method is not called).

Test.java

public class Test extends JFrame {

    private JPanel contentPane;
    public static Container root;

    /**
     * Launch the application.
     */

     public static void main(String[] args) {

        try {
            Test frame = new Test();

            new JNIServer().hello("world");  // where hello is native method
            frame.setVisible(true);

        } catch (Exception e) {
            e.printStackTrace();        
        }
    }       
}
JNIServer.java

public class JNIServer{

    public native void hello(String name);  

    static {  
         System.out.println("Inload library");
         System.loadLibrary("JNI_Lib");     
    }  
}

JNIServer.c

#include <stdio.h>

#include "JNIServer.h"


JNIEXPORT void JNICALL Java_JNIServer_hello
  (JNIEnv *env, jobject jthis, jstring sims)
{

	printf(" C: In hello ");

}